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Single speed bikes are often known as Fixed gearor fixie bikes.
But Most people don't know the difference between a fixie and a single speed bike.
It's all in the hub
Mechanically, the difference is so small that you might not spot it even when you are looking for it. It all comes down to the rear hub and how the single cog is connected to the rest of the drivetrain. Single speeds are fitted with a freewheel cog that rotates freely one way but locks up the other. This means that the cog will turn the rear wheel when you pump those pedals, but then freewheel when the rear wheel starts turning faster than the cog - much like a geared bike.

When it comes to Fixies, it has no mechanism on the hub. The cog is fixed into the hub. If the rear wheel turns, the cog turns, and if the cog turns, the pedals turn with that. I admit the difference is not so small, but one that has a huge effect on how a bike rides and requires some consideration before you decide on a bike.
If you want to know more about Single speed and fixed gear bike
Have look on this Gear bike review Blog.

Loosen the nut that holds the back wheel and pull it back until the chain is tight and then retighten the nut. If when the chain is tight, the wheel is not on the rear frame, you need to take a link out of the chain.

Angie,
Have patience. It will come to you. There are two levers, because there are two places where the gears change - in the front (by the pedals) and on the back wheel. You might find it easier to just use one lever. Do this--- have someone help you hold the bike so that the back wheel is off the ground. Turn the pedals on the bike and work one shift lever at a time so that you can see which lever is for the front vs. the rear. If you have three gears in the front (the correct name is chain-rings) then leave the front one so that the chain is on the middle chain ring. If there are two, then select the larger one. Now shift the back one (the gears back there are called cogs). You might have 5,6,7 or even 8 cogs back there. Practice shifting the back cogs to see what is happening. If you find that the chain comes off, even when you leave the front on on the middle chain ring, you need an adjustment.
Good luck!
Al K

Put the chain to the inside of the front cog wheel, beside the pedals, first but not onto it, so you have plenty of room for pulling the chain to the rear. Fit the wheel back into place and before tightening it pull down the spring loaded arm, with the small cog wheel beside the back wheel. This takes the tension off the chain and allows you to put it into place on the back wheel. Tighten up the wheel. When it's tightened fit the chain onto the top of the front cog wheel. Lift the back wheel off the ground and turn the pedals forward. The chain will click onto the front cog wheel when you have turned the pedals one complete turn.

There's a trick to putting a chain back on a bike. First fit it onto the back wheel. Then hold it on the top of the front cog wheel (at the pedals) Get someone to lift the back of the bike so the wheel is off the ground. While the wheel is off the ground and you're holding the chain on the top of the front cog wheel turn the pedals forward, with your other hand, as when you're cycling and as it turns the chain will go on.

If you don't have someone to hold the back wheel up off the ground you could hold the chain on the bottom of the front cog wheel and turn the pedal backwards. The chain will still go on.

Congratulations on learning to ride the bike. I use the rear gears mainly i.e. the gears on the right hand side. Each rear gear makes a little difference so it makes it a little easier to go uphill. (When the chain is on the back smallest cog wheel it's hardest to pedal and easiest on the largest. The reverse is true of the front cog wheels) If you come to a very steep hill you should use the front gears i.e. the lever on the left hand side. This makes a bigger difference to the effort needed to climb a hill. When you have put the front gear into the easiest position, (on the smallest cog wheel) you can still use your rear gears to make it easier still. For going on flat ground or downhill most people keep both sets of gears on the hardest gear. (The front gears on the largest cog wheel and the rear one on the smallest) However there's no rule that says you have to. Use the one that feels you're using just enough energy to turn the pedals and in time you won't have to even think about the gears. I hope this helps.

sounds like the starter is not disengaging the fly wheel quickly like it should when you turn the key the starter cog connects upto a fly wheel that has teeth all around it when the teeth of starter cog connect between teen on wheel it spins it to crank your car then goes back to starter if you hold your key on after starting the noise you hear is the starter cog(teeth ) still engaged in wheel if this is the sound it needs to be serviced not neccassarily replaced

there is the temp fix-epoxy when putting it on (actually can work well, just dont epoxy it on the bottom and freeze it or the permanent fix -new hook cover complete where the cog is'nt going to come off on the new part

I suggest you look at the flywheel to make sure there are no missing or rounded teeth. Next I'd check the bendix on the starter to make sure you did not lose a bushing or bearing. If the engagement bearing is shot you will have definite problems with the starter.